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Write Characterization Tests Before the First Extract

This story is from 2026-09-04. It is preserved in the archive; the latest stories are on the live feed.

A checkout helper in a brownfield shop repository has no tests, three authors, and a comment that says do not touch. The function mixes coupon stacking, tax rounding, and a loyalty multiplier that only fires on Thursdays. An agent can rewrite the file in one pass, and the diff will look clean while…

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  1. 2026-09-04 17:34 · DEV Community — AI
    Write Characterization Tests Before the First Extract

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